Difference between Short Day Plants and Long Day Plants MCQ - Practice Questions with Answers

A set of plants when grown at 14 hours day length, they flowered, but when the same type of plant are grown at 9 hours day length, they do not flowered. The plant is  

Which one among these is not a characteristic of Short Day Plants?

Assertion :Xanthium is a long day plant.

Reason : It needs a critical day length of 15 hours 30 minutes and will flower if the critical day length will be 15 hours 30 minutes or more than that.

Fill in the blanks (a, b, c and d) in the following statements with a proper combination of m, no and p.

Wherein  m represents - longer
               n represents - shorter 
               o represents - prevents
               p represents - induces

Short day (SD) plants flower when night lengths are ___a___ than a critical dark period. Interruption of the dark period by a brief light treatment ____ b___ flowering in SD plants. Long day (LD) plants flower when night length is ____c___ than a critical period. Shortening of the night with a brief light treatment _____d____ flowering in LD plants.

One set of a plant was grown at 12 hr day and 12 hr night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flowers. Under which one of the following categories will you place this plant?

Directions: In the following questions, a statement of Assertion (A) is followed by a statement of reason (R).

Assertion: Dark period is critical in short day plants 

Reason: A brief exposure of light in dark period can stimulates flowering.

Mark the correct choice as:

Which of the following plants requires light exposure less than the critical period to initiate flowering?